| 单词 | impaction |
| 释义 | impaction /im pak"sheuhn/, n. 1. an act or instance of impacting. 2. the state of being impacted; close fixation. 3. Dentistry. the condition in which a tooth is impacted. [1730-40; < LL impaction- (s. of impactio), equiv. to L impact(us), ptp. of impingere (see IMPACTED) + -ion- -ION] |
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